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Noise eliminating apparatus and receiver

a technology of noise elimination and receiver, which is applied in the direction of gain control, instruments, transmission, etc., can solve the problem that the conventional technique is not adapted to eliminate pulse noise, and achieve the effect of removing pulse nois

Inactive Publication Date: 2005-06-30
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] In the case of the conventional technique, the noise of the low frequency component included in the sound signal is extracted and subtracted from the original sound signal. Consequently, there is a problem such that the conventional technique is not adapted to eliminate pulse noise. One object of the invention is to solve the problem.

Problems solved by technology

Consequently, there is a problem such that the conventional technique is not adapted to eliminate pulse noise.

Method used

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  • Noise eliminating apparatus and receiver
  • Noise eliminating apparatus and receiver
  • Noise eliminating apparatus and receiver

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first embodiment

[0031]FIG. 1 is a block diagram showing the configuration of a noise eliminating apparatus and a receiver of a first embodiment. As shown in FIG. 1, a receiver 1 comprises: a receiving device 2 including an antenna 21, a high frequency amplifier (RF amplifier) 22, a frequency mixer (MIX) 23, a local oscillator (OSC) 24, an intermediate frequency filter (IF filter) 25, and a detector 26; and a noise eliminating apparatus 3 including a noise detector 31, a threshold generator 32, a gate pulse generator 33, and a gate 34.

[0032] As the receiving device 2, a general super heterodyne receiver is used. An electromagnetic wave is received from the space by the receiver 1 via the antenna 21. The RF amplifier 22 amplifies a high-frequency reception signal S1 received by the receiver 1 via the antenna 21. The frequency mixer 23 mixes a high-frequency signal S2 amplified by the RF amplifier 22 with an oscillation signal S3 of the local oscillator 24, and converts the frequency difference betwe...

second embodiment

[0044]FIG. 5 is a block diagram showing the configuration of a main portion of a noise eliminating apparatus of a second embodiment. As shown in FIG. 5, the second embodiment is similar to the first embodiment except that a holding circuit 35 and a switch 36 are provided between the threshold generator 32 and the gate pulse generator 33. The holding circuit 35 retains the threshold S9 output from the threshold generator 32. The switch 36 switches between the threshold S9 output from the threshold generator 32 and a threshold S13 held in the holding circuit 35 and supplies the selected threshold to the gate pulse generator 33. The other configuration is the same as that of the first embodiment. The same reference numerals are designated to the same components as those of the first embodiment and their description will not be repeated.

[0045]FIG. 6 is a circuit diagram conceptually showing the configuration of the holding circuit 35 and the switch 36. As shown in FIG. 6, the holding c...

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Abstract

A noise detector extracts pulse noise. On the basis of the extracted pulse noise, a threshold generator generates a threshold. A gate pulse generator compares the pulse noise with the threshold and, when the waveform of the pulse noise exceeds the threshold, generates a gate pulse. During the gate pulse is generated, a gate inhibits outputting of a demodulated signal of a detector, and during the period, interpolates the signal to output the resultant, thereby eliminating pulse noise from an output signal of the gate.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a noise eliminating apparatus and a receiver having the same. The use of the invention is not limited to the receiver and a diversity receiving method. [0003] 2. Description of the Related Art [0004] Hitherto, a sound processing apparatus having the function of eliminating noise in a sound signal is known (refer to, for example, Japanese Patent Application Laid-open No. 7-177597). The disclosure of the corresponding U.S. Pat. No. 5,568,559A is incorporated by reference in its entirety. In the apparatus disclosed in this patent document, low frequency components in a digital sound signal are extracted by a low pass filter (hereinbelow, abbreviated as LPF). A necessary frequency area of a sound signal is extracted by a band pass filter (hereinbelow, abbreviated as BPF). An output of the LPF and an output of the BPF are compared with each other to thereby detect an amount of wind noise....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/10G10L21/02H03G3/34
CPCH03G3/345G10L21/0208
Inventor OHASHI, TORU
Owner PIONEER CORP
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